EXST 2201-Exam 1 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
What is an effective way to think of data in the science of statistics? - CORRECT ANSWER
As a column of numbers.
Choose the answer below that correctly ranks the sizes of the following. - CORRECT ANSWER
Population > Sample > Individual.
A local cell phone store wants to know how much money, on average, their customers spend at the
store. Using store records, they draw a sample of 450 customers and record the amount spent. The
average of this data is calculated to answer the shoe store's question. Match each question with its
answer below. - CORRECT ANSWER What is the population? : All customers at the store.
What is the sample? : The 450 customers.
What is an individual? : Each customer.
LSU wants to conduct a survey of high school seniors in Louisiana concerning their plans for future
education. The survey asks three questions: gender, GPA, and number of siblings. Match each variable
with its type below. - CORRECT ANSWER Gender. : Qualitative.
GPA. : Continuous.
Siblings. : Discrete.
Information about automobiles was collected and put into a data set with three columns. The columns
contained information on: Weight; Number of Seats; and Body Style. Match each variable with the
type of data it contains below. - CORRECT ANSWER Weight. : Continuous.
Number of Seats. : Discrete.
Body Style. : Qualitative.
What type of variable is the focus of much of the science of statistics? - CORRECT ANSWER
Continuous random variables.
A properly done random sample always results in a good sample of the population? - CORRECT
ANSWER No because random sampling does not guarantee a good sample.
,At a birthday party, teams are chosen by putting everyone's name into a hat. Then names are drawn
from the hat to make up each team. What type of sampling is this? - CORRECT ANSWER
Random sampling without replacement.
In a data set used in statistics (imagine a MS Excel spreadsheet), match each type of information with
its location below. - CORRECT ANSWER Variable information. : In a column.
Individual information. : In a row.
All the information. : In the data set.
The Gallup News Service sent out 2,000 questionnaires for a survey about climate change. 1,004
people responded to the survey and gave their opinion. What type of data study is this survey? -
CORRECT ANSWER An observational data study.
Which one of the following situations cannot be used as a data set in the science of statistics? -
CORRECT ANSWER An image of the milky way.
Statistics is the science of decision making using random selection of choices. - CORRECT
ANSWER No statistics uses a random selection of individuals.
A local cell phone store wants to know how much money their customers spend at the store. They
decide to use the average as the indicator. Using store records, they draw a sample of 450 customers
and record the amount spent. Match each question with its answer below. - CORRECT ANSWER
What is an individual? : Each customer.
What is the variable measured? : The amount of money spent.
What statistic answers this question? : The average amount spent.
A researcher is curious about the IQ of students at a local university. The entire group of students
enrolled in the university is an example of what? - CORRECT ANSWER A population.
What is the third step in the method to determine the type of data.
1. Pick any two data values.
2. Can they be ranked on the Real Number Line? - CORRECT ANSWER Are there more than
fifteen possible data values?
, A five-point Likert scale uses the values of strongly disagree, disagree, neutral, agree, and strongly
agree). What type of data is given by a Likert scale? - CORRECT ANSWER Categorical data.
What type of data is the time in a 500 meter ice skating speed race? - CORRECT ANSWER
Continuous data.
If simple random sampling does not guarantee a good sample, representative of the population, why
use simple random sampling at all? - CORRECT ANSWER Because there is no better way to
get a sample.
IQ tests are standardized so that the mean score is 100 for the entire group of people who take the test.
However, if you select a group of 50 people who took the test, you probably would not get a sample
average of 100. What statistical concept explains the difference between the two values? - CORRECT
ANSWER Sampling error.
At a local seminar, every attendee was given a ticket having a number. During the seminar, numbers
were randomly calculated, and a small gift was given to the attendee with that number. Is it possible
for an attendee to get more than one gift? - CORRECT ANSWER Yes because this is sampling
with replacement.
Sampling with replacement can give a sample size larger than the population, but does sampling with
replacement give more information about the population? - CORRECT ANSWER No because
the same information is being reused.
Are columns of data values that are constants allowed in a data set used in the science of statistics? -
CORRECT ANSWER Yes but they might not be used in the statistical analysis.
What is the source of the information contained in the columns of a statistical data set? - CORRECT
ANSWER Variable information.
What type of study of data is putting cages of fish in different areas of a large lake and measuring
their growth rate? - CORRECT ANSWER Both of these other answers
Is statistics the science of making random decisions? - CORRECT ANSWER No, statistics is a
science based on randomly selected data.
QUESTIONS AND CORRECT ANSWERS
What is an effective way to think of data in the science of statistics? - CORRECT ANSWER
As a column of numbers.
Choose the answer below that correctly ranks the sizes of the following. - CORRECT ANSWER
Population > Sample > Individual.
A local cell phone store wants to know how much money, on average, their customers spend at the
store. Using store records, they draw a sample of 450 customers and record the amount spent. The
average of this data is calculated to answer the shoe store's question. Match each question with its
answer below. - CORRECT ANSWER What is the population? : All customers at the store.
What is the sample? : The 450 customers.
What is an individual? : Each customer.
LSU wants to conduct a survey of high school seniors in Louisiana concerning their plans for future
education. The survey asks three questions: gender, GPA, and number of siblings. Match each variable
with its type below. - CORRECT ANSWER Gender. : Qualitative.
GPA. : Continuous.
Siblings. : Discrete.
Information about automobiles was collected and put into a data set with three columns. The columns
contained information on: Weight; Number of Seats; and Body Style. Match each variable with the
type of data it contains below. - CORRECT ANSWER Weight. : Continuous.
Number of Seats. : Discrete.
Body Style. : Qualitative.
What type of variable is the focus of much of the science of statistics? - CORRECT ANSWER
Continuous random variables.
A properly done random sample always results in a good sample of the population? - CORRECT
ANSWER No because random sampling does not guarantee a good sample.
,At a birthday party, teams are chosen by putting everyone's name into a hat. Then names are drawn
from the hat to make up each team. What type of sampling is this? - CORRECT ANSWER
Random sampling without replacement.
In a data set used in statistics (imagine a MS Excel spreadsheet), match each type of information with
its location below. - CORRECT ANSWER Variable information. : In a column.
Individual information. : In a row.
All the information. : In the data set.
The Gallup News Service sent out 2,000 questionnaires for a survey about climate change. 1,004
people responded to the survey and gave their opinion. What type of data study is this survey? -
CORRECT ANSWER An observational data study.
Which one of the following situations cannot be used as a data set in the science of statistics? -
CORRECT ANSWER An image of the milky way.
Statistics is the science of decision making using random selection of choices. - CORRECT
ANSWER No statistics uses a random selection of individuals.
A local cell phone store wants to know how much money their customers spend at the store. They
decide to use the average as the indicator. Using store records, they draw a sample of 450 customers
and record the amount spent. Match each question with its answer below. - CORRECT ANSWER
What is an individual? : Each customer.
What is the variable measured? : The amount of money spent.
What statistic answers this question? : The average amount spent.
A researcher is curious about the IQ of students at a local university. The entire group of students
enrolled in the university is an example of what? - CORRECT ANSWER A population.
What is the third step in the method to determine the type of data.
1. Pick any two data values.
2. Can they be ranked on the Real Number Line? - CORRECT ANSWER Are there more than
fifteen possible data values?
, A five-point Likert scale uses the values of strongly disagree, disagree, neutral, agree, and strongly
agree). What type of data is given by a Likert scale? - CORRECT ANSWER Categorical data.
What type of data is the time in a 500 meter ice skating speed race? - CORRECT ANSWER
Continuous data.
If simple random sampling does not guarantee a good sample, representative of the population, why
use simple random sampling at all? - CORRECT ANSWER Because there is no better way to
get a sample.
IQ tests are standardized so that the mean score is 100 for the entire group of people who take the test.
However, if you select a group of 50 people who took the test, you probably would not get a sample
average of 100. What statistical concept explains the difference between the two values? - CORRECT
ANSWER Sampling error.
At a local seminar, every attendee was given a ticket having a number. During the seminar, numbers
were randomly calculated, and a small gift was given to the attendee with that number. Is it possible
for an attendee to get more than one gift? - CORRECT ANSWER Yes because this is sampling
with replacement.
Sampling with replacement can give a sample size larger than the population, but does sampling with
replacement give more information about the population? - CORRECT ANSWER No because
the same information is being reused.
Are columns of data values that are constants allowed in a data set used in the science of statistics? -
CORRECT ANSWER Yes but they might not be used in the statistical analysis.
What is the source of the information contained in the columns of a statistical data set? - CORRECT
ANSWER Variable information.
What type of study of data is putting cages of fish in different areas of a large lake and measuring
their growth rate? - CORRECT ANSWER Both of these other answers
Is statistics the science of making random decisions? - CORRECT ANSWER No, statistics is a
science based on randomly selected data.
